An observational study in General Anesthesia, Hemodynamics and Noise Exposure, sponsored by Başakşehir Çam & Sakura City Hospital. Recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-05.
Sponsored by Başakşehir Çam & Sakura City Hospital · Observational
This prospective observational study aims to evaluate the impact of operating room noise on bispectral index (BIS) and hemodynamic parameters in patients undergoing general anesthesia. Environmental noise in operating rooms, often overlooked, may influence anesthesia depth, patient safety, and physiological stability. A total of 70 adult patients (ASA I-II, 18-65 years, elective surgery under general anesthesia) will be enrolled at Başakşehir Çam and Sakura City Hospital. Patients will be categorized into two groups based on intraoperative average noise levels: noisy group (>65 dB) and quiet group (\<55 dB). Noise levels will be measured every 10 minutes using a CEM DT-8850 sound level meter, BIS will be recorded every 10 minutes, and hemodynamic variables (systolic, diastolic, mean arterial pressure, and heart rate) will be recorded every 5 minutes.
Primary outcome is the correlation between mean intraoperative noise levels (LAeq) and BIS values during the maintenance phase of anesthesia. Secondary outcomes include the relationship between noise characteristics (e.g., device-related, human-related, alarms, media) and hemodynamic stability, as well as surgical branch-related noise classifications (high, moderate, low). The study is non-interventional, with no additional risk to participants beyond standard clinical monitoring. Findings are expected to provide evidence on the role of environmental noise in anesthesia quality, inform operating room organization, and contribute to patient safety improvements.
Operating room (OR) noise is a common but underestimated environmental factor that may affect both patients and medical staff. In patients under general anesthesia, excessive noise may influence depth of anesthesia, physiological stability, and recovery outcomes.This prospective observational study will investigate the correlation between intraoperative noise levels and bispectral index (BIS) values, as well as hemodynamic parameters (systolic, diastolic, and mean arterial pressure, and heart rate). Seventy adult patients undergoing elective surgery under general anesthesia will be monitored. Noise levels will be measured every 10 minutes with a calibrated sound level meter (CEM DT-8850), while BIS and hemodynamic parameters will be recorded at 10-minute and 5-minute intervals, respectively. Additionally, the type of noise (device-related, human-related, alarms, media) and the surgical branch (classified into high, moderate, or low noise categories) will be documented. Data will be analyzed to determine whether environmental noise correlates with BIS fluctuations and hemodynamic stability. The study is observational only and involves no intervention beyond standard anesthesia practice. Results are expected to raise awareness of environmental influences on anesthesia management and provide recommendations for OR organization to enhance patient safety.
Başakşehir Çam & Sakura City Hospital is the lead sponsor of 109 studies on the registry; 36 are open to participants now.
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Adult patients aged 18-70 years undergoing elective surgery under general anesthesia at Başakşehir Çam and Sakura City Hospital will be included. Eligible participants must have ASA physical status I-II, be cognitively able to provide informed consent, and scheduled for surgeries lasting up to 2 hours. Both male and female patients will be enrolled without restriction. Only elective (non-emergency) procedures are considered. Surgeries from multiple specialties (orthopedics, neurosurgery, cardiovascular, general surgery, gynecology, urology, ophthalmology, otolaryngology, plastic surgery, dermatology) will be included, representing high, moderate, and low noise exposure categories.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Patients exposed to average OR noise level \>65 dB during general anesthesia.
Other: Intraoperative Noise Monitoring
Patients exposed to average OR noise level \<55 dB during general anesthesia.
Other: Intraoperative Noise Monitoring
Noise levels will be passively measured during surgery using a calibrated sound level meter (CEM DT-8850) placed near the patient's head. Measurements will be taken every 10 minutes without physical contact or interference with clinical care. The procedure is purely observational and does not modify anesthesia or surgical practice.
Also known as: CEM DT-8850 Sound Level Meter, Operating Room Noise Measurement
Correlation between intraoperative noise levels and BIS values
Relationship between mean intraoperative noise levels (LAeq, dB(A)) and mean Bispectral Index (BIS) values during the maintenance phase of general anesthesia.
Time frame: 10-minute intervals intraoperative period
Relationship between intraoperative noise levels and hemodynamic parameters
Association between average intraoperative noise level (LAeq, dB(A)) and hemodynamic variables (systolic blood pressure, diastolic blood pressure, mean arterial pressure, and heart rate). Hemodynamic parameters will be recorded at 5-minute intervals, while noise levels will be measured at 10-minute intervals.
Time frame: Intraoperative period
Effect of noise source type on BIS and hemodynamic stability
Evaluation of whether noise source categories (device-related, human-related, alarms, media) are associated with changes in BIS and hemodynamic parameters. Noise type will be recorded by independent observer every 10 minutes.
Time frame: Intraoperative period.
Comparison of BIS and hemodynamic outcomes across surgical branches
Surgical specialties will be classified into high, moderate, or low noise categories. BIS and hemodynamic data will be compared across these groups.
Time frame: Intraoperative period.
Plan to share: No — Individual participant data (IPD) will not be shared due to privacy and confidentiality concerns. Only aggregated results will be published in scientific journals and conferences.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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